Okay I see what you are talking about with the three buttons next to the email address in Sugar. I guess this is more of an issue with Sugar then, because you cannot filter by "email address opted out" in the list view. I am sure you can create a report, but filters are what our sales reps use in list view. That is probably why I created the custom opt out field awhile back. It also does not show right away when I open up the record that it is an opted out email address... you have to click to edit that email address field to see that it is opted out.